Bellamya crassa (Benson 1836) is treated as Mekongia crassa by Nesemann et al. (2007). Grosse and Fischer (1876) established a subgenus Mekongia for thick-shelled species from the Mekong River basin (Brandt 1974).

It is found in the Ganges-Brahmaputra river systems of India and Bangladesh, and from other basins in eastern and southern India. In India, it is reported from Sikkim, Andhra Pradesh, Assam, Gujarat, Karnataka, Meghalaya, Orissa, Uttar Pradesh and West Bengal (Nadia) (Ramakrishna and Dey 2007). It's presence in other states within India is likely.